Sequence of cardiac activation, Biology

Assignment Help:

Sequence of Cardiac Activation

Depolarisation is initiated by an impulse form the SA node. Impulse spreads through both atria. Inter-atrial conduction and atrial myocardial depolarization creates the "P" wave in the cardiac cycle. The normal time taken is 0.08 to 0.12 seconds. The impulse reaches the AV node which delays the impulse about 0.04 to 0.01 seconds. The impulse is transmitted along the branches of the bundle of His to the Purkinje fibers, activating both ventricles almost simultaneously. Activation of ventricular muscle proceeds from apex towards base of heart. The time for a normal ventricular depolarization to occur is 0.06 to 0.10 seconds. PR interval represents the amount of time the electrical impulse takes form the beginning of atrial depolarization to the beginning of ventricular excitation. Normal time is 0.12 o 0.20 seconds. After depolarization, there is ventricular depolarization indicated by the "T" wave in the ECG.

The heart's electrical physiology serves to maintain a coordinated cycle for the electrical depolarization of myocardial fibers that produce chamber filling and emptying.


Related Discussions:- Sequence of cardiac activation

Explain bone resorption, An  osteoclast  is a type of bone cell that absorb...

An  osteoclast  is a type of bone cell that absorbs bone tissue by removing its mineralized matrix and breaking up the  organic bone. This process is known as bone resorption

Haemostatic mechanisms - circulation, Normal 0 false false ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Artificial parthenogenesis, Artificial Parthenogenesis In various cas...

Artificial Parthenogenesis In various cases, the eggs that normally develop only after fertilisation can be experimentally induced to develop parthenogenetically by specific

Regeneration and its examples, R E GENER A TIO N - Natural ability...

R E GENER A TIO N - Natural ability of living being to replace worn out parts, to repair damaged parts, to regrow cost off organs & to reform entire body from a small piec

Define adsorption chromatography -basic separation technique, Define Adsorp...

Define Adsorption chromatography - Basic Separation Technique? Adsorption is surface interaction and is by number of forces, between surface atoms of solids and molecules of ex

Explain why this drug would eventualy kill a person, Dinitrophenol, DNP, wa...

Dinitrophenol, DNP, was prescribed in low doses in the 1940's to help obese patients lose weight. It's use for this purpose was discontinued when several users died. DNP makes the

Nutrition, define alimentary canal

define alimentary canal

Density of water in relation to temperature, Density of Water in Relation t...

Density of Water in Relation to Temperature On cooling, water molecules come closer which makes water dense. It is most dense at 4°C (Figure shown below) but it is still a liqu

Visceral larva migrans, Visceral larva migrans Visceral larva migrans,...

Visceral larva migrans Visceral larva migrans, also known as larval granulomatosis, is a clinical syndrome produced by the extra-intestinal migration of larval nematodes and i

Explain assessment of iron status - transferrin receptors, Explain assessme...

Explain assessment of iron status - Transferrin receptors? Transferrin receptors: As iron deficiency progresses into second stage, the number of transferrin receptors on the ce

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd